FFmpeg
avs.c
Go to the documentation of this file.
1 /*
2  * AVS demuxer.
3  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Argonaut Games' Creature Shock demuxer
25  * @see http://wiki.multimedia.cx/index.php?title=AVS
26  */
27 
28 #include "avformat.h"
29 #include "demux.h"
30 #include "voc.h"
31 
32 
33 typedef struct avs_format {
34  VocDecContext voc;
37  int width;
38  int height;
40  int fps;
41  int nb_frames;
44 } AvsFormat;
45 
46 typedef enum avs_block_type {
47  AVS_NONE = 0x00,
48  AVS_VIDEO = 0x01,
49  AVS_AUDIO = 0x02,
50  AVS_PALETTE = 0x03,
51  AVS_GAME_DATA = 0x04,
52 } AvsBlockType;
53 
54 static int avs_probe(const AVProbeData * p)
55 {
56  const uint8_t *d;
57 
58  d = p->buf;
59  if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
60  /* Ensure the buffer probe scores higher than the extension probe.
61  * This avoids problems with misdetection as AviSynth scripts. */
62  return AVPROBE_SCORE_EXTENSION + 5;
63 
64  return 0;
65 }
66 
68 {
69  AvsFormat *avs = s->priv_data;
70 
71  s->ctx_flags |= AVFMTCTX_NOHEADER;
72 
73  avio_skip(s->pb, 4);
74  avs->width = avio_rl16(s->pb);
75  avs->height = avio_rl16(s->pb);
76  avs->bits_per_sample = avio_rl16(s->pb);
77  avs->fps = avio_rl16(s->pb);
78  avs->nb_frames = avio_rl32(s->pb);
79  avs->remaining_frame_size = 0;
80  avs->remaining_audio_size = 0;
81 
82  avs->st_video = avs->st_audio = NULL;
83 
84  if (avs->width != 318 || avs->height != 198)
85  av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
86  "when the avs format is supposed to be 318x198 only.\n",
87  avs->width, avs->height);
88 
89  return 0;
90 }
91 
92 static int
94  AvsBlockType type, int sub_type, int size,
95  uint8_t * palette, int palette_size)
96 {
97  AvsFormat *avs = s->priv_data;
98  int ret;
99 
100  ret = av_new_packet(pkt, size + palette_size);
101  if (ret < 0)
102  return ret;
103 
104  if (palette_size) {
105  pkt->data[0] = 0x00;
106  pkt->data[1] = 0x03;
107  pkt->data[2] = palette_size & 0xFF;
108  pkt->data[3] = (palette_size >> 8) & 0xFF;
109  memcpy(pkt->data + 4, palette, palette_size - 4);
110  }
111 
112  pkt->data[palette_size + 0] = sub_type;
113  pkt->data[palette_size + 1] = type;
114  pkt->data[palette_size + 2] = size & 0xFF;
115  pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
116  ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
117  if (ret < size) {
118  return AVERROR(EIO);
119  }
120 
121  pkt->size = ret + palette_size;
122  pkt->stream_index = avs->st_video->index;
123  if (sub_type == 0)
125 
126  return 0;
127 }
128 
130 {
131  AvsFormat *avs = s->priv_data;
132  int ret;
133  int64_t size;
134 
135  size = avio_tell(s->pb);
136  ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
137  size = avio_tell(s->pb) - size;
138  avs->remaining_audio_size -= size;
139 
140  if (ret == AVERROR(EIO))
141  return 0; /* this indicate EOS */
142  if (ret < 0)
143  return ret;
144  if (size != (int)size) {
146  return AVERROR(EDOM);
147  }
148 
149  pkt->stream_index = avs->st_audio->index;
151 
152  return size;
153 }
154 
156 {
157  AvsFormat *avs = s->priv_data;
158  int sub_type = 0, size = 0;
160  int palette_size = 0;
161  uint8_t palette[4 + 3 * 256];
162  int ret;
163 
164  if (avs->remaining_audio_size > 0)
165  if (avs_read_audio_packet(s, pkt) > 0)
166  return 0;
167 
168  while (1) {
169  if (avs->remaining_frame_size <= 0) {
170  if (!avio_rl16(s->pb)) /* found EOF */
171  return AVERROR(EIO);
172  avs->remaining_frame_size = avio_rl16(s->pb) - 4;
173  }
174 
175  while (avs->remaining_frame_size > 0) {
176  sub_type = avio_r8(s->pb);
177  type = avio_r8(s->pb);
178  size = avio_rl16(s->pb);
179  if (size < 4)
180  return AVERROR_INVALIDDATA;
181  avs->remaining_frame_size -= size;
182 
183  switch (type) {
184  case AVS_PALETTE:
185  if (size - 4 > sizeof(palette))
186  return AVERROR_INVALIDDATA;
187  ret = avio_read(s->pb, palette, size - 4);
188  if (ret < size - 4)
189  return AVERROR(EIO);
190  palette_size = size;
191  break;
192 
193  case AVS_VIDEO:
194  if (!avs->st_video) {
195  avs->st_video = avformat_new_stream(s, NULL);
196  if (!avs->st_video)
197  return AVERROR(ENOMEM);
198  avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
199  avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
200  avs->st_video->codecpar->width = avs->width;
201  avs->st_video->codecpar->height = avs->height;
202  avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
203  avs->st_video->nb_frames = avs->nb_frames;
204 #if FF_API_R_FRAME_RATE
205  avs->st_video->r_frame_rate =
206 #endif
207  avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
208  }
209  return avs_read_video_packet(s, pkt, type, sub_type, size,
210  palette, palette_size);
211 
212  case AVS_AUDIO:
213  if (!avs->st_audio) {
214  avs->st_audio = avformat_new_stream(s, NULL);
215  if (!avs->st_audio)
216  return AVERROR(ENOMEM);
217  avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
218  }
219  avs->remaining_audio_size = size - 4;
221  if (size != 0)
222  return size;
223  break;
224 
225  default:
226  avio_skip(s->pb, size - 4);
227  }
228  }
229  }
230 }
231 
233  .p.name = "avs",
234  .p.long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
235  .priv_data_size = sizeof(AvsFormat),
239 };
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: packet.c:429
AVS_NONE
@ AVS_NONE
Definition: avs.c:47
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVS_VIDEO
@ AVS_VIDEO
Definition: avs.c:32
avs_read_audio_packet
static int avs_read_audio_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:129
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
int64_t
long long int64_t
Definition: coverity.c:34
avs_format::height
int height
Definition: avs.c:38
AVPacket::data
uint8_t * data
Definition: packet.h:539
avs_read_video_packet
static int avs_read_video_packet(AVFormatContext *s, AVPacket *pkt, AvsBlockType type, int sub_type, int size, uint8_t *palette, int palette_size)
Definition: avs.c:93
AVS_AUDIO
@ AVS_AUDIO
Definition: avs.c:33
avs_format::nb_frames
int nb_frames
Definition: avs.c:41
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:594
avs_format::width
int width
Definition: avs.c:37
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
ff_avs_demuxer
const FFInputFormat ff_avs_demuxer
Definition: avs.c:232
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:714
AvsBlockType
AvsBlockType
Definition: avs.c:31
avs_format::bits_per_sample
int bits_per_sample
Definition: avs.c:39
AVS_GAME_DATA
@ AVS_GAME_DATA
Definition: avs.c:35
pkt
AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:209
avs_format
Definition: avs.c:33
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:42
s
#define s(width, name)
Definition: cbs_vp9.c:198
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: packet.c:98
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
avs_format::st_video
AVStream * st_video
Definition: avs.c:35
avs_format::voc
VocDecContext voc
Definition: avs.c:34
AVFormatContext
Format I/O context.
Definition: avformat.h:1300
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:540
NULL
#define NULL
Definition: coverity.c:32
AVFMTCTX_NOHEADER
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1251
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
avs_format::st_audio
AVStream * st_audio
Definition: avs.c:36
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:461
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
AVPacket::size
int size
Definition: packet.h:540
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
size
int size
Definition: twinvq_data.h:10344
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:603
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:545
AVS_PALETTE
@ AVS_PALETTE
Definition: avs.c:34
voc.h
ff_voc_get_packet
int ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
Definition: voc_packet.c:27
AV_CODEC_ID_AVS
@ AV_CODEC_ID_AVS
Definition: codec_id.h:134
avs_read_packet
static int avs_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: avs.c:155
demux.h
avs_format::fps
int fps
Definition: avs.c:40
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:748
avformat.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
AVPacket::stream_index
int stream_index
Definition: packet.h:541
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
avs_block_type
avs_block_type
Definition: avs.c:46
avs_format::remaining_frame_size
int remaining_frame_size
Definition: avs.c:42
AVPacket
This structure stores compressed data.
Definition: packet.h:516
FFInputFormat
Definition: demux.h:37
avs_format::remaining_audio_size
int remaining_audio_size
Definition: avs.c:43
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
avs_read_header
static int avs_read_header(AVFormatContext *s)
Definition: avs.c:67
avs_probe
static int avs_probe(const AVProbeData *p)
Definition: avs.c:54